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To add the fraction 105-22/42, we need to find a common denominator. The denominator of the first fraction is 1, and the denominator of the second fraction is 42. To find a common denominator, we can multiply the denominator of the first fraction by 42, and the denominator of the second fraction by 1.

105-22/42 = (105*42)/42 - 22/42

= 4410/42 - 22/42

Now that we have a common denominator, we can combine the numerators:

= (4410 - 22)/42

= 4388/42

Simplifying the fraction, we can divide both the numerator and denominator by their greatest common divisor, which is 2:

= 2194/21

So, 105-22/42 is equal to 2194/21.